dns-rebinding
DNS rebinding attack to bypass browser same-origin policy and reach IMDS/localhost/internal services: TTL=0 rebind mechanics, rbndr.us/singularity tooling, browser DNS cache pinning, chaining into AWS/GCP/Azure IMDS credential pivot. Use when SSRF is blocked but a victim browser can be induced to make requests, or when a localhost service is exposed. Triggers on: 'dns rebinding', 'rebind', 'DNS TTL 0', 'singularity', 'rbndr', 'localhost bypass via browser', 'imds via browser', 'SSRF via DNS'.
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Critical
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Security
3 findings: 2 critical severity, 1 high severity. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E005: Suspicious download URL detected in skill instructions.
What this means
Detected a suspicious URL in the skill instructions that could lead the agent to download and execute malicious scripts or binaries. This includes links to executables from untrusted sources, typosquatting of official packages, URL shorteners that obscure the destination, and personal file hosting services.
Why it was flagged
These URLs are attacker-controlled endpoints (including a rebinding host and payload page) used in DNS-rebinding and IMDS credential-exfiltration attacks, so they are malicious/suspicious rather than legitimate download sources.
E006: Malicious code pattern detected in skill scripts.
What this means
Detected high-risk code patterns in the skill content — including its prompts, tool definitions, and resources — such as data exfiltration, backdoors, remote code execution, credential theft, system compromise, supply chain attacks, and obfuscation techniques.
Why it was flagged
This document is an explicit, step-by-step guide for conducting DNS rebinding attacks that instruct how to exfiltrate internal service responses and cloud IMDS credentials to an attacker-controlled collector, i.e., intentional credential theft and data exfiltration.
W007: Insecure credential handling detected in skill instructions.
What this means
The skill handles credentials insecurely by requiring the agent to include secret values verbatim in its generated output. This exposes credentials in the agent’s context and conversation history, creating a risk of data exfiltration.
Why it was flagged
The skill explicitly instructs creating payloads that fetch and exfiltrate internal secrets (including IMDS AccessKey/Secret/Token) and shows code that transmits credential values (e.g., base64 exfiltration), which requires the agent to handle and output secret values verbatim.
- Repository
- PurpleAILAB/Decepticon
- Commit
0cf691e
- Audited
- Security analysis
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